SAR [Specific Absorption Rate]

Now everyone interested to buy Smart Phones. We are also known to the excess usage of these phones will cause health issues.

Here the most important thing you may need to understand the SAR value rate for your phone. This will give you a clearer picture of the amount of radio frequency energy absorbed by the body when using a mobile phone.

The neutral value is calculated as 1.6 watts per kilogram (1.6 W/kg). So the value below this number will be considered as safe [ actually not 100%].

You can check Radiation level on your smart phone by dialing *#07#

So the main advantage of using Apple iPhone is its low SAR Value, it's below 0.01

shred and scrub

Scrub and shred commands are useful when you are installing Linux/Unix operating systems , when the previous tech/person has used windows or other copyright softwares on that drive.

We don't know what are the pirated software, whether he/she has installed on the disk. It would be better to wipe out all data , so that the third party recovery (Micro-Soft inspections, etc )makes them very difficult.



 wget http://mirrors.kernel.org/ubuntu/pool/universe/s/scrub/scrub_2.2-2_amd64.deb
 
dpkg -i scrub_2.2-2_amd64.deb

Command:
 scrub -p dod -f /dev/

  root@Ajeesh-desktop:~# scrub -p dod -f /dev/sdb1
scrub: using DoD 5220.22-M patterns
scrub: please verify that device size below is correct!
scrub: scrubbing /dev/sdb1 75391565824 bytes (~70GB)
scrub: random  |................................................|
scrub: 0x00    |................................................|
scrub: 0xff    |................................................|
scrub: verify  |................................................|
root@Ajeesh-desktop:~#

named.run using huge size

On a cpanel server we can see /var/named/data/named.run is using huge size. This is a log file and we can safely truncate this file.

cd /var/named/data
[/var/named/data]#  >named.run